-rix
The problem is that tekkit requires new chunks to be generated from scratch, and unless someone world-edits the world and marks the currently generated chunks' borders with something, the only way to find fresh chunks would be to dig down and find the new ores. Even then the current world is heavily walked around. Bear in mind that a 3-chunk radius around a player is generated. With 8 players walking around and 2 ( me and meys ) have gone to 10k+ in one direction, finding new chunks is quite hard. If a world-edit is in order anyway, why not copy all your stuff to the new world and play there?